store-0: uploaded data is converted to json

[atla5]

Background

• in order to become editable/extensible the data contained in the csv needs to be stored in some middle format
• additional functionality depends on this data to be more visible and readable than a simple 'file' would allow

Success Criteria

• after (as?) its being uploaded, data is converted to json
• this json makes meaningful distinction between headers and items
• information is added such as upload_date, time_logged, etc for use later
• csv download reads from this